The Grey Company Trebuchet Page. April 2004.
Accessed on 10~Sept~2004
<http://members.iinet.net.au/%7Ermine/gctrebs.html>.Ron Tom's Trebuchet.Com. November 2004.
Accessed on 10~Sept~2004
<http://www.trebuchet.com>.Nova Online, Secrets of the Lost Empires. November 2000.
Accessed on 11~Sept~2004
<http://www.pbs.org/wgbh/nova/lostempires/trebuchet/>.Gravett, Christopher, and Hook, Richard and Christa; Medieval Siege Warfare
Osprey Publishing, 1990.Warry, John Gibson; Warfare in the Classical World,
An illustrated encyclopedia of weapons, warriors, and warfare in the ancient cilvilizations of Greece and Rome.
University of Oklahoma Press,October 1995.
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